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Ernst Bauer: Improved thermoelectric performance of bulk and thin film full-Heusler systems based on Fe2VAl
Begin: 20.01.2021, 14:10
Location: ZOOM Meeting ID: 958 0426 7376

Volodymyr Buturlim: Uranium in metastable systems: structure, magnetism, superconductivity
Begin: 27.01.2021, 14:10
Location: ZOOM Meeting ID: 958 0426 7376

Lukáš Nádvorník: Terahertz and optical spintronics in ferro- and antiferromagnets
Begin: 24.02.2021, 14:10
Location: ZOOM Meeting ID: 958 0426 7376

 
Title: Anne de Visser: Type-I superconductivity in the Dirac semimetal PdTe2
Number: 37/20
Status: Closing date exceeded
Begin: Středa, 16.12. 2020, 14:10
Tutor: Vladimír Sechovský
Location: ZOOM Meeting ID: 958 0426 7376


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We have a pleasure to invite you to attend the joint seminar
of the Department of Condensed Matter Physics (DCMP)
and the Materials Growth and Measurement Laboratory (MGML) http://mgml.eu.

 

Program

 

Type-I superconductivity in the Dirac semimetal PdTe2

lecture given by:

Anne de Visser

Van der Waals–Zeeman Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands

 

https://cesnet.zoom.us/j/95804267376
Meeting ID: 958 0426 7376

on Wednesday, 16.12. 2020 from 14:10 CET (13.10 UTC)


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Vladimír Sechovský
On behalf of the DCMP and MGML


Abstract 

The family of transition metal dichalcogenides attracts ample attention, because of the ubiquitous presence of topological features in the electronic band structure. Here the focus is on PdTe2 that was classified as a Type-II Dirac semimetal [1], and becomes superconducting below Tc = 1.6 K [2]. This prompts the question whether superconductivity has a topological nature. In this presentation I report an in-depth characterization of the superconducting properties of PdTe2 by means of electrical resistivity, magnetization, susceptibility and heat capacity measurements carried out on single crystalline samples [3]. Surprisingly, we find that PdTe2 is a Type-I superconductor, which is rare for a binary compound. Type-I behaviour is furthermore confirmed by the detection of the intermediate state in μSR experiments [4]. Interestingly, we also find an unusual type of surface superconductivity corroborated by the ac-screening signal, which is robust under high pressure [5]. The unusual field-temperature phase diagram, with bulk and surface superconductivity, will be discussed in view of the topological electronic structure of PdTe2.

References

[1] M.S. Bahramy et al., Nat. Mater. 17, 21 (2018).
[2] J. Guggenheim et al., Helv. Phys. Acta 34, 408 (1961).
[3] H. Leng et al., Phys. Rev. B 96, 220506(R) 2017.
[4] H. Leng et al., Phys. Rev. B 100, 224501 (2019).
[5] H. Leng et al., J. Phys. Cond. Mat. 32, 025603 (2020).